Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells are impaired in what way?
A) They cannot replicate DNA.
B) They cannot undergo mitosis.
C) They cannot exchange DNA with other cells.
D) They cannot repair thymine dimers.
E) They do not recombine homologous chromosomes during meiosis.

Question

Quizplus · Accepted Answer

Xeroderma pigmentosum is caused by impaired nucleotide excision repair, specifically the inability to repair thymine dimers caused by UV radiation. This results in a high risk of skin cancer and sun sensitivity.

Individuals with the Disorder Xeroderma Pigmentosum Are Hypersensitive to Sunlight